Roller grinding-mill



l Patented Jan. 6, 1891.

W. D. GRAY. ROLLER GRIN-DING MILL.

@Mfg

(No Model.)

UNIT-Eni! STATES 'PATENT' Genion.: ,f

VILLIAM GRAY, OF MILIVAKEE, WISCONSIN, ASSIGNOR TO THE EDWARD l?. ALLIS COMPANY, OF WISCONSIN.

ROLLER GRlNDlNG-MILL.'

SPECIFICATION forming part of Letters Patent N o. 444,350, dated January 6, 1891. Application filed August 24*y `1889. Serial No. 321,814. (No model.)

To @ZZ whom it may concern:

Be it known that I, WILLIAM D. GRAY, of Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented certain Improvements in Roller Grinding-Mills, of which the following is a specilication.

This invention relates to that class of grinding-mills in which one of two co-operating rolls is mounted inbearings adjustable in such manner as to permit a variation in the distance between the rolls and also admit of their being kept in exact alignmentfthat is to say, with their grinding-surfaces parallel.

The invention has reference to a construction in which the boxes of the movable roll are arranged to slide to and from the opposite roll upon arms which are laterally adjustable to secure the alignment of the rolls, the construction being of the same character as and subordinate to that represented in my application for Letters Pat-eut, Serial No. 321,812, led of even date herewith.

In the accompanying drawings, Figure l is a side elevation of the principal parts of a grinding-mill having myimprovement incorporated therein, portions being shown in section on the line o; :r of Fig. 2. Fig. 2 is a top plan view of the same.

In the drawings, A represents the main frame; B, a horizontal grinding-roll mounted in stationary bearings, as usual, or otherwise suitably supported; C, the co-operating roll, and D D the boxes in which the ends of the movable roll are mounted. These boxes are mounted to slide endwise upon the cylindrical ends of the arms E E'. The bars lie horizontally on opposite'sides of the main frame and are mounted on horizontal pivots or supports, so that the ends which carry the boxes may be adjusted vertically to a limited extent, in order to bring the axis of the movable roll to a true horizontal position. The pivotal supports may be of any construction which will allow the vertical vibration of the arms; but I prefer to mount them to turn on the eccentrics F, carried by a common rockshaft G, so that when the shaft is rotated the eccentrics will carry the arms and boxes horizontally, and thus close or spread the rolls, according as the grinding operation is to be started or stopped. The boxes are supported by vertical screws I, bearing thereunder and seated in lugs on the main frame, these screws serving to raise and lower the boxes independently to edect the alignment of the rolls before alluded to.

In place of the screws, wedges, eccentrics, or other equivalent devices familiar to the skilled mechanic may be employed as a means of raising and lowering the boxes.

Each of the boxes is recessed to receive a strong spiral spring L, bearing in its inner end thereon. A threaded neck e, forming a continuation of the box-supporting arm, is projected outward through the spiral spring and provided at the outer end with an adjustable washer and nut K, by means of which the spring may be compressed and caused to urge the box and roll-lever with more or less pressure, as required. By these parts the roll is held to its grinding position under ordinary conditions, but permitted to retreat from its companions if subjected to excessive resistance. The movement of the movable roll toward its companion is limited and contact of the rolls prevented by'a handscrew M, threaded through an npturned arm d on the outer end of the box D, and arranged to bear against the end of the neck or screw e.

It will be observed that when the eccentrics are turnedto spread or close the rolls the arms E E are carried horizontally, together with the boxes, the springs, and other intermediate adjusting devices, these several parts moving together and Without changing their relative positions.

Ido not claim herein, broadly, the roll-snstaining boxes arranged to slide on horizontal sustaining-arms which are adjustable longitudinally and vertically, nor the combination of said parts with pressure mechanism, the same being the subject-matter of application N o. 321,812, referred to above.

Having thus described my invention, what I claim is* l. In a roller grinding-mill, and in combination with a main frame,V the roll B and cooperating roll O, the boxes sustaining the latter and provided with the upturned outer ends, the horizontal guide-arms Whereon the boxes slide, provided with threaded necks, the eccentrics sustaining said arms at one end, supports for the boxes and free omis of to limit the inward motion of the boxes, ihe guidearnis,the springs acting at one end sp1-ings mounted on the arius and urging the against the boxes, the spring-confining nuts boxes inward, horizontal pivots sustainingapplied to the necks, and the stop-screws the guide-arms at one end, and .vertically-ad- Seated in the boxes to limit their inward n10- j ustabie Supportslnounted on the main frame.

tion. In testimony whereof I hereunto set my 2. In a roller grinding-mill, a main frame, i hand in the presence of two attesting Wita grinding-roll, roll-sustaining,` boxes, horinesses. zontai guide-arms whereon the boxes slide 1 WILLIAM D. GRAY. and by which they are maintained in posii Witnesses: tion, adjustable stop-screws mounted in the RICHARD I-IOPPIN, boxes and abutting against the guide-arms i EDW. F. BYRON. 

